本文選題：隧道　切入點(diǎn)：偏壓　出處：《西南交通大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：隧道穿越山體時(shí),在淺埋地段受地形的影響,襯砌結(jié)構(gòu)很容易處于偏壓的受力狀態(tài),當(dāng)偏壓隧道處于高寒地區(qū)時(shí),由于冬季溫度較低,夏季溫度相對(duì)較高,偏壓隧道將承受凍融循環(huán)帶來的不利影響。因此,研究偏壓隧道的地震動(dòng)力響應(yīng)規(guī)律以及溫度因素對(duì)偏壓隧道地震動(dòng)力響應(yīng)的影響具有重大的工程意義。本文通過數(shù)值模擬的方法分析了偏壓隧道的地震動(dòng)力響應(yīng)特性,并在此基礎(chǔ)上探究了溫度場(chǎng)對(duì)其動(dòng)力響應(yīng)的影響。本文的主要研究工作及成果如下：(1)通過收集整理山嶺隧道震害資料,明確了研究地形因素及溫度因素對(duì)偏壓隧道動(dòng)力響應(yīng)影響的重要性。(2)分析了單一圍巖條件下偏壓山嶺隧道洞口結(jié)構(gòu)的動(dòng)力響應(yīng),得出結(jié)論：偏壓地形會(huì)增大洞口段長(zhǎng)度。在Ⅳ級(jí)圍巖、邊坡傾角30°條件下,洞口段長(zhǎng)度相比非偏壓條件下洞口段長(zhǎng)度放大了1.5倍。(3)通過取距洞口30m處橫斷面進(jìn)行分析,研究了不同邊坡傾角下隧道結(jié)構(gòu)的地震動(dòng)力響應(yīng)。偏壓隧道在地震作用下的彎矩峰值、剪力峰值在靠山側(cè)拱腳處最大,軸力峰值在背山側(cè)拱肩處最大。滿足一定的工程精度時(shí),Ⅳ級(jí)圍巖、拱頂埋深15m條件下,偏壓隧道與非偏壓隧道在地震作用下的臨界邊坡傾角可取為20°。(4)研究了不同邊坡覆土厚度對(duì)偏壓隧道動(dòng)力響應(yīng)的影響。隨著邊坡覆土厚度的增加,隧道各部位動(dòng)力響應(yīng)的不對(duì)稱性逐漸減弱。動(dòng)力條件下臨界覆土厚度約為靜力條件下根據(jù)塌落拱理論計(jì)算的臨界覆土厚度的1.8～1.96倍。(5)研究了凍融循環(huán)對(duì)偏壓隧道動(dòng)力響應(yīng)的影響。研究表明,凍融循環(huán)對(duì)偏壓隧道在地震期間位移和內(nèi)力響應(yīng)時(shí)程規(guī)律無明顯影響,只是改變了位移和內(nèi)力的響應(yīng)峰值�？紤]凍融循環(huán)時(shí),偏壓隧道位移響應(yīng)峰值和內(nèi)力響應(yīng)峰值相比不考慮凍融循環(huán)時(shí)均有所增加。
[Abstract]:When the tunnel passes through the mountain body, the lining structure is easy to be in the state of bias pressure when the tunnel passes through the mountain body. When the tunnel is in the high and cold area, the temperature is relatively high in summer because of the lower temperature in winter. The bias tunnel will suffer the adverse effects of freeze-thaw cycles. It is of great engineering significance to study the seismic dynamic response of the bias tunnel and the influence of temperature factors on the seismic dynamic response of the bias tunnel. In this paper, the seismic dynamic response characteristics of the bias tunnel are analyzed by numerical simulation. On this basis, the influence of temperature field on its dynamic response is explored. The main work and results of this paper are as follows: 1) through collecting and sorting out the seismic damage data of mountain tunnels, The importance of studying the influence of topographic factors and temperature factors on the dynamic response of the eccentric tunnel is defined. (2) the dynamic response of the tunnel entrance structure under the condition of single surrounding rock is analyzed. Under the condition of grade 鈪，

本文編號(hào)：1619787